Metal-coated seat retention groove

ABSTRACT

Disclosed is a valve comprising: an annular body defining a body bore having a bore axis, the body further defining a channel coannular with the bore, the channel comprising an axially outer edge defining a seat retention groove, the seat retention groove comprising a metal barrier; an annular valve seat positioned in the channel, the valve seat comprising a radially inner surface; and a valve element positioned in the bore and coupled to the body, the valve element comprising a rotatable disc configured to rotate about and between a closed position, in which the rotatable disc is configured to prevent fluid from flowing through the valve, and an open position, in which the rotatable disc is configured to allow maximum fluid flow through the valve, the radially inner surface of the valve seat configured to seal against the rotatable disc in the closed position.

TECHNICAL FIELD

This disclosure relates to valves. More specifically, this disclosurerelates to a metal-coated seat retention groove on a valve body.

BACKGROUND

Valve bodies are typically made from cast iron or steel. In a butterflyvalve, a rotatable disc can form a seal with a valve seat made of aflexible material, such as rubber. One way to secure or fasten the valveseat is through a mechanism involving inserting a head of a bolt into aretention groove. The groove is a wetted area, meaning it is exposed tofluids flowing through the valve. Wetted areas can be coated with epoxyto prevent corrosion. Coating the groove with epoxy, however, can causethe available space in the groove to narrow, such that the head of thebolt can no longer fit.

SUMMARY

It is to be understood that this summary is not an extensive overview ofthe disclosure. This summary is exemplary and not restrictive, and it isintended to neither identify key or critical elements of the disclosurenor delineate the scope thereof. The sole purpose of this summary is toexplain and exemplify certain concepts of the disclosure as anintroduction to the following complete and extensive detaileddescription.

Disclosed is a valve comprising: an annular body defining a body borehaving a bore axis, the body further defining a channel coannular withthe bore, the channel comprising an axially outer edge defining a seatretention groove, the seat retention groove comprising a metal barrier;an annular valve seat positioned in the channel, the valve seatcomprising a radially inner surface; and a valve element positioned inthe bore and coupled to the body, the valve element comprising arotatable disc configured to rotate about and between a closed position,in which the rotatable disc is configured to prevent fluid from flowingthrough the valve, and an open position, in which the rotatable disc isconfigured to allow maximum fluid flow through the valve, the radiallyinner surface of the valve seat configured to seal against the rotatabledisc in the closed position.

Also disclosed is a valve comprising: a valve body defining a body borehaving a bore axis, the body further defining a channel coannular withthe bore, the channel comprising an axially outer edge defining anannular seat retention groove, wherein the groove is coannular with thebore of the valve body; a corrosion-resistant metal barrier over theseat retention groove, the barrier defining a first and a second edge,each barrier edge coannular with the bore; and an epoxy coating over thefirst and the second barrier edges.

Also disclosed is a method of manufacturing a valve with acorrosion-resistant barrier, the method comprising: obtaining a valvebody defining a body bore having a bore axis, the body further defininga channel coannular with the bore, the channel comprising an axiallyouter edge defining a seat retention groove; and thermal spraying acorrosion-resistant barrier over the seat retention groove, whereinthermal spraying comprises heating a material forming thecorrosion-resistant barrier, and spraying a plurality of particlesresulting from heating the material.

Various implementations described in the present disclosure may includeadditional systems, methods, features, and advantages, which may notnecessarily be expressly disclosed herein but will be apparent to one ofordinary skill in the art upon examination of the following detaileddescription and accompanying drawings. It is intended that all suchsystems, methods, features, and advantages be included within thepresent disclosure and protected by the accompanying claims. Thefeatures and advantages of such implementations may be realized andobtained by means of the systems, methods, features particularly pointedout in the appended claims. These and other features will become morefully apparent from the following description and appended claims, ormay be learned by the practice of such exemplary implementations as setforth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and components of the following figures are illustrated toemphasize the general principles of the present disclosure. The drawingsare not necessarily drawn to scale. Corresponding features andcomponents throughout the figures may be designated by matchingreference characters for the sake of consistency and clarity.

FIG. 1 is a front view of a valve in accordance with one aspect of thepresent disclosure.

FIG. 2 is a cross-sectional view of a valve body of the valve of FIG. 1,taken along line 2-2 of FIG. 1.

FIG. 3 is a detail view of a channel of the valve body of FIG. 2 takenfrom Detail 3 in FIG. 2.

FIG. 4 is a cross-sectional view of the channel of FIG. 3, furthercomprising a seating mechanism.

FIG. 5 is a perspective view of a portion of the seating mechanism ofFIG. 4.

FIG. 6 is a perspective view of a segment of the seating mechanism ofFIG. 4, showing an axially outer side.

FIG. 7 is a perspective view of the segment of FIG. 6, showing anaxially inner side.

FIG. 8 is a perspective view of a bolt and a nut of the seatingmechanism of FIG. 4.

FIG. 9 is a cross-sectional view of the channel of FIG. 2 during acoating process to add a barrier to the channel.

FIG. 10 is a perspective view of a thermal spray exiting a nozzle.

DETAILED DESCRIPTION

The present disclosure can be understood more readily by reference tothe following detailed description, examples, drawings, and claims, andthe previous and following description. However, before the presentdevices, systems, and/or methods are disclosed and described, it is tobe understood that this disclosure is not limited to the specificdevices, systems, and/or methods disclosed unless otherwise specified,and, as such, can, of course, vary. It is also to be understood that theterminology used herein is for the purpose of describing particularaspects only and is not intended to be limiting.

The following description is provided as an enabling teaching of thepresent devices, systems, and/or methods in its best, currently knownaspect. To this end, those skilled in the relevant art will recognizeand appreciate that many changes can be made to the various aspects ofthe present devices, systems, and/or methods described herein, whilestill obtaining the beneficial results of the present disclosure. Itwill also be apparent that some of the desired benefits of the presentdisclosure can be obtained by selecting some of the features of thepresent disclosure without utilizing other features. Accordingly, thosewho work in the art will recognize that many modifications andadaptations to the present disclosure are possible and can even bedesirable in certain circumstances and are a part of the presentdisclosure. Thus, the following description is provided as illustrativeof the principles of the present disclosure and not in limitationthereof.

As used throughout, the singular forms “a,” “an” and “the” includeplural referents unless the context clearly dictates otherwise. Thus,for example, reference to “an element” can include two or more suchelements unless the context indicates otherwise.

Ranges can be expressed herein as from “about” one particular value,and/or to “about” another particular value. When such a range isexpressed, another aspect includes from the one particular value and/orto the other particular value. Similarly, when values are expressed asapproximations, by use of the antecedent “about,” it will be understoodthat the particular value forms another aspect. It will be furtherunderstood that the endpoints of each of the ranges are significant bothin relation to the other endpoint, and independently of the otherendpoint.

For purposes of the current disclosure, a material property or dimensionmeasuring about X or substantially X on a particular measurement scalemeasures within a range between X plus an industry-standard uppertolerance for the specified measurement and X minus an industry-standardlower tolerance for the specified measurement. Because tolerances canvary between different materials, processes and between differentmodels, the tolerance for a particular measurement of a particularcomponent can fall within a range of tolerances.

As used herein, the terms “optional” or “optionally” mean that thesubsequently described event or circumstance can or cannot occur, andthat the description includes instances where said event or circumstanceoccurs and instances where it does not.

The word “or” as used herein means any one member of a particular listand also includes any combination of members of that list. Further, oneshould note that conditional language, such as, among others, “can,”“could,” “might,” or “may,” unless specifically stated otherwise, orotherwise understood within the context as used, is generally intendedto convey that certain aspects include, while other aspects do notinclude, certain features, elements and/or steps. Thus, such conditionallanguage is not generally intended to imply that features, elementsand/or steps are in any way required for one or more particular aspectsor that one or more particular aspects necessarily include logic fordeciding, with or without user input or prompting, whether thesefeatures, elements and/or steps are included or are to be performed inany particular aspect.

Disclosed are components that can be used to perform the disclosedmethods and systems. These and other components are disclosed herein,and it is understood that when combinations, subsets, interactions,groups, etc. of these components are disclosed that while specificreference of each various individual and collective combinations andpermutation of these may not be explicitly disclosed, each isspecifically contemplated and described herein, for all methods andsystems. This applies to all aspects of this application including, butnot limited to, steps in disclosed methods. Thus, if there are a varietyof additional steps that can be performed it is understood that each ofthese additional steps can be performed with any specific aspect orcombination of aspects of the disclosed methods.

The use of the directional terms herein, such as right, left, front,back, top, bottom, and the like can refer to the orientation shown anddescribed in the corresponding figures, but these directional termsshould not be considered limiting on the orientation or configurationrequired by the present disclosure. The use of ordinal terms herein,such as first, second, third, fourth, and the like can refer to elementsassociated with elements having matching ordinal numbers. For example, afirst light bulb can be associated with a first light socket, a secondlight bulb can be associated with a second light socket, and so on.However, the use of matching ordinal numbers should not be consideredlimiting on the associations required by the present disclosure. Anelement such as a light bulb can be a genus element that encompassesspecies elements such as an upper light bulb and a lower light bulb. Assuch, a numeric designator such as 100 can refer to the light bulb andan alphanumeric designator such as 100 a and 100 b can refer to theupper light bulb and the lower light bulb, for example and withoutlimitation.

Disclosed is a valve with a corrosion-resistant barrier and associatedmethods, systems, devices, and various apparatus. It would be understoodby one of skill in the art that the valve is described in but a fewexemplary embodiments among many. No particular terminology ordescription should be considered limiting on the disclosure or the scopeof any claims issuing therefrom.

FIG. 1 is a front view of a valve 100 in accordance with one aspect ofthe present disclosure. The valve 100 can comprise a body 102, a valveseat 104, and a valve element 106. The valve body 102 can define a bore108, the bore 108 defining an inlet end 220 (shown in FIG. 2) and anoutlet end 230 (shown in FIG. 2), a flow of fluid through the valve 100configured to flow from the inlet end 220 to the outlet end 230, or viceversa. The valve element 106 can be disposed within the bore 108. Thevalve element 106 can be configured to seal against the valve seat 104.The valve element 106 in FIG. 1 is shown in a closed position. In theaspect shown, the valve 100 can be a butterfly valve, and the valveelement 106 can be a rotatable disc 110.

The valve 100 can further comprise a valve shaft 120 attached to thedisc 110, the valve shaft 120 rotatable about its axis within a shafthole 122 (shown in FIG. 2) of the valve body 102, allowing the disc 110to rotate. In the current aspect and without limitation, the valve 100can comprise two stems or shafts 120, a first upper shaft 120 a attachedto a top 124 of the valve element 106 and a second lower shaft 120 b(hidden within the valve body 102 in the view of FIG. 1) attached to abottom 126 of the valve element 106. A bottom 128 of the valve body 102can define a lower shaft hole 122 b (shown in FIG. 2) therethrough andcan comprise a bottom cap 130 that captures the lower shaft 120 b,allowing the lower shaft 120 b to rotate therein. The upper shaft 120 acan extend through an upper shaft hole 122 a at the top of the valvebody 102 to engage with a valve actuator (not shown), such as a handwheel, lever, gear box, or any other desired actuator. The shaft 120 canbe attached to the disc 110 by bolts or any other attachment mechanism.The valve body 102 can define holes 134 near its outer circumference,the holes 134 configured to receive attachment mechanisms such as boltsfor joining a flange (not shown) on an adjacent piping element or amechanical joint, such as seal gland for joining plain end pipingelements.

FIG. 2 is a cross-sectional view of the valve body 102, taken along line2-2. As shown, the valve element 106 and the valve seat 104 are removed.The valve body 102 can define a rotation axis 216 through the shafts 120and the disc 110. The disc 110 can rotate about the axis 216 between aclosed position, in which the rotatable disc 110 is configured toprevent fluid from flowing through the valve 100, and an open position,in which the rotatable disc 110 is configured to allow maximum fluidflow through the valve 100. The bore 108 can define a bore axis 214running longitudinally through the bore. A transverse cross section ofthe bore can be defined by a middle plane 218 that contains the rotationaxis 216.

The valve body 102 can define a channel 202 configured to house aseating mechanism 402 (shown in FIG. 4). The channel 202 can be offsetfrom the middle plane 204 of the valve body 102. The channel 202 cancomprise an annular conduit 206. The channel can define a surface 208. Acylindrical channel bottom portion 210 of the surface can be parallel tothe bore axis 214 of the valve body 102. An axial cross-section of theshaft holes 122 a,b can be seen in this view. Detail 3 is shown in FIG.3.

FIG. 3 is a detail view of the channel 202 of the valve body 102 (shownin FIG. 1) of FIG. 2 taken from Detail 3 in FIG. 2. The channel 202 canfurther comprise an axially inner edge 302 that is angled with respectto the plane 204 (shown in FIG. 2) of the valve body 102. The conduit206 can be located where the inner edge 302 and the channel surface 208meet. The channel 202 can further comprise an axially outer edge 304that is parallel to the plane 204. The outer edge 304 can further definea retention groove 306 that extends annularly around the bore 108 (shownin FIG. 2). The groove 306 can comprise an inside wall 308, a radiallyinner wall 310, and a radially outer wall 312. The groove walls 308,310,312 can define a rectangular cross-section, and the groove 306 cancomprise inside corners 314 and outside corners 316 that can becurvilinear fillets, for example and without limitation. The axiallyouter edge 304 of the channel 202 can meet a valve opening wall 320 atan edge 318 of the valve body 102, wherein the edge 318 can be a filletwith a curvilinear cross-section.

FIG. 4 is the same cross-sectional view of the channel 202 of FIG. 2,further comprising a seating mechanism 402. The seating mechanism 402can comprise the valve seat 104. The valve seat 104 can have a radiallyouter surface 404 opposite a radially inner surface 406. An axiallyinner surface 408 and an axially outer surface 410 can extend betweenthe radially outer surface 404 and the radially inner surface 406. Theaxially inner surface 408 can be angled with respect to a perpendicular412 of the radially outer surface 404, the seat 104 profile configuredto match the conduit 206 profile, such that the space therebetween canbe sealed off from fluids. The axially inner surface 408 and theradially inner surface 406 can comprise ribs 460 running coannularlywith the valve seat 104, the ribs 460 configured to make first contactwith the channel inner edge 302 or an edge 462 of the valve element 106,in order to create a better sealing interface.

The valve seat 104 can be monolithic and can be constructed from asingle or continuous piece of material. In one aspect, the valve seat104 can be constructed from a deformable material such as a polymericmaterial, a polymeric-lubricant mixture and the like. In other aspects,the entire valve seat 104 can be formed from the deformable material. Insome of these aspects, the valve seat 104 can be homogenous throughoutthe entire valve seat 104. The polymeric material of the valve seat 104can be ethylene propylene diene monomer (“EPDM”) rubber; however, inother aspects, the polymeric material can be a different rubberformulation such as Buna-N, neoprene, nitrile, Viton, silicone rubber orother rubber formulations. In some aspects, the polymeric material canbe a natural rubber.

The seating mechanism 402 can further comprise a segment 414 adjacent tothe axially outer surface 410 of the valve seat 104. A plurality ofsegments 414 can extend end-to-end around the channel 202. An axiallyinner side 416 of the segment 414 can comprise a convex portion 418configured to press the seat 104 into the conduit 206. The segment 414can also comprise an axially outer side 420, a radially inner side 422,and a radially outer side 424. The axially outer side 420 can define ahole 426, the hole 426 configured to receive a bolt 428. The bolt 428can comprise a head 430 and a threaded tail 432. The tail 432 can beinserted into the hole 426 of the segment 414. The hole 426 can beannular and be sized with a diameter 434 greater than a diameter 802(shown in FIG. 8) of the tail 432, such that the threads of the tail 432do not engage with an annular side 436 of the hole 426.

The head 430 of the bolt 428 can be a regular polygon, such as a squareor a hexagon. The groove 306 of the channel 202 can receive the head 430and be configured to restrict rotation of the bolt about its axis 440. Anut 438 can be disposed on the tail 432 of the bolt 428, such thatrotation of the nut 438 in one direction moves the nut 438 axiallyinward towards the conduit 206. The nut 438 can be a nyloc nutconfigured to resist loosening, or any other similar alternative knownin the art. The segment 414 can be pushed by the nut 438 in the samedirection, squeezing the seat 104 and forcing the deformable radiallyinner surface 406 of the seat 104 further radially inward. As such, theseat 104 can contact a greater portion of the valve element 106 (shownin FIG. 1) when the valve 100 (shown in FIG. 1) is closed.

The channel retention groove 306, or more simply the groove 306, cancomprise a radially inner portion 442, a radially outer portion 444, andan axially outer portion 446 therebetween. The radially inner portion442 and the radially outer portion 444 can define a width 448therebetween. The width 448 can be slightly larger than a height 450 ofa face 452 of the bolt head 430. The slightly larger width 448 can allowfor a non-corrosive layer or cover to be applied (such as by spraying)to the groove 306, such that the groove 306 comprising the layer canstill receive the bolt head 430.

FIG. 5 is a perspective view of the seating mechanism 402. In this view,one can see the valve element 106 (reversed from its operationalconfiguration, such that the valve seat 104 can be maintained), thevalve body 102, the valve seat 104, the segments 414, the bolts 428, andthe nuts 438. The groove 306 cannot be seen from this angle, but itexists below the axially inner edge 318 of the valve opening wall 320.The heads 430 (shown in FIG. 2) of the bolts 428 can be inside thegroove 306 (shown in FIG. 3) and prevented from rotation, and the nuts438 can be tightened up against the segments 414, thereby securing thevalve seat 104. Each segment 414 can comprise a tongue end 510 and agroove end 512, the groove end 512 of each segment 414 configured toreceive the tongue end of an adjacent segment 414, thereby bettercontrolling the contour of a ring of segments around the valve body 102annulus.

FIG. 6 is a perspective view of the axially outer side 420 of thesegment 414. The segment 414 can comprise two holes 426 configured toreceive the tails 432 of the bolts 428 (shown in FIG. 4). The tongue end510 can comprise a tongue 610 that is flush, or coplanar, with thesegment on the axially outer side 420. A thickness 612 of the tongue 610can be less than a thickness 710 (shown in FIG. 7) of the segment 414defined by a distance between the axially outer side 420 and aninnermost portion of the axially inner side 416. The groove end 512 candefine a groove 614, the groove having a depth 616 (measured in adirection along the bore axis 214 when the segment 414 is fastened tothe valve body 102) less than the segment thickness 710 (shown in FIG.7), the groove 614 configured to receive the tongue 610 withoutsubstantial space therebetween.

FIG. 7 is a perspective view of the axially inner side 416 of thesegment 414. In this view, the convex portion 418 can be seen, which isconfigured to push into the valve seat 104 (not shown). The tonguethickness 612 and the segment thickness 710 are more clearly shown.

FIG. 8 is a perspective view of the bolt 428 with the nut 438. In thecurrent aspect, the bolt head 430 has a square face 452. A square head430 can provide a greater contact area for the radially inner portion442 (shown in FIG. 4) and the radially outer portion 444 (shown in FIG.4) of the groove 306 (shown in FIG. 3), such that the nut 438 can betightened against the segment 414 (shown in FIG. 4) with a greatertorque.

FIG. 9 is the cross-sectional view of FIG. 2, wherein the groove 306 iscoated with a barrier 902. The valve body 102 is typically made fromcast iron or steel, materials which are susceptible to corrosion.Surfaces which are exposed to fluids are called wetted surfaces, whichmay require protection from corrosion. Thermosetting epoxy basedcoatings can provide such protection, in the form of barriers 902 on thewetted surfaces. The AWWA C504 Butterfly Valve Standard requires aminimum epoxy coating thickness of 8 mils (0.008″) to be applied tounprotected ferrous surfaces. Using epoxy to protect the retentiongroove 306, however, can make it difficult to install the seatingmechanism 402 (shown in FIG. 4). The required thickness of the epoxycoating can interfere with placing the bolt heads 430 (shown in FIG. 4)into the groove 306 by decreasing the size of the groove 430. Even ifthe seating mechanism 402 can be installed, the torque used to tightenthe nuts 438 (shown in FIG. 4) can damage an epoxy barrier 902. Eachtime the seat 104 (shown in FIG. 1) is replaced or reinstalled, theepoxy barrier 902 can be further damaged, such that epoxy barrier 902must be reapplied. Epoxy can be reapplied after the seating mechanism402 has been reinstalled, so that removing all the bolts 428 during seat104 reinstallation is not necessary. Reapplication, however, is mademore difficult because there are numerous crevices between the bolts 428and the groove 306 which are difficult to reach. In addition, someinstallations may require holiday-free coating on all internal wettedsurfaces. Using epoxy for such holiday-free coatings may require athickness in the range of 18-24 mils (0.018″-0.024″). This thickness canrender the groove 306 unsuitable for installing the seating mechanism402.

Applying a metal barrier, such as by a plasma or thermal sprayingprocess (discussed more fully in reference to FIG. 10), may alleviatesome of the problems associated with an epoxy barrier. For example, astainless steel barrier 902 can be thinner than an epoxy coating andprovide similar or superior protection. For example and withoutlimitation, the stainless steel barrier can have a thickness ofapproximately 0.004 inches or 0.007 inches. The plasma spray coatingprocess can be configured to apply the stainless steel such that thestainless steel will not flake off.

The barrier 902 can extend completely around the annular groove 306, andin the cross-sectional view of FIG. 9, the barrier 902 can extend tocover different portions in various aspects. In the aspect shown, thebarrier 902 can extend from a first barrier edge 904 at the edge 318 ofthe valve opening wall 320 to a second barrier edge 906 at the channelsurface 208 proximate the axially outer edge 304. In other aspects, thebarrier 902 can extend slightly beyond the outside corners 316 of thegroove 306, or the barrier 902 can extend over the whole channel 202,for example and without limitation.

The spray process may not define a sharp or a clean line at the barrieredges 904,906. The barrier edges 904,906 may instead define a taperingoff in thickness. In other aspects, tapes or other blocking mechanismsappropriate for high temperature spraying can be used to create a cleanbarrier edge 904,906. In accordance with one aspect of the presentdisclosure, the method of applying the metal barrier 902 can comprisedirecting a plasma spray 908 at the groove 306, spraying metal towardthe groove 306, and rotating the valve body 102 about the bore axis 214(not shown) such that the metal barrier 902 covers the groove 306. Invarious aspects, the plasma spray 908 can be directed by a nozzle 1001in various motions to affect the barrier 902 properties, such asthickness, width, and uniformity. For example, the plasma spray 908 canremain in a fixed position. The plasma spray 908 can also movetranslationally in a radially inward and outward direction as the valvebody 102 is rotating, in order to achieve a desired width between thefirst and second barrier edges 904,906. The plasma spray 908 can alsomove according to the contours of the valve body 102, the movementcomprising a combination of rotations and translations, such that thespray 908 can maintain a direction facing the target surface at alltimes.

The barrier 902 coating can be applied to bare metal on the valve body102. As such, bare corrodible metal such as cast iron or steel can beexposed on the valve body 102 surface at the barrier edges 904,906.Epoxy can be applied to the valve body 102, and particularly at and overthe barrier edges 904,906, after the plasma spray process.

As shown in FIG. 10 in accordance with one aspect of the presentdisclosure, the barrier 902 (not shown) can be applied by a thermalspray coating process such as plasma spraying. The barrier 902 can beformed of a non-corrosive or corrosion-resistant metal, such as 316stainless steel or bronze. Thermal spraying techniques are coatingprocesses in which melted or heated materials are sprayed onto asurface. The coating precursor, or feedstock, can be heated byelectrical means, such as by plasma or arc, or chemical means, such asby combustion flame. Thermal spraying can provide thin to thickcoatings, ranging from approximately 20 microns to several millimetersin thickness, depending on the process and feedstock. Thermal sprayingcan cover a large area at high deposition rate as compared to othercoating processes such as electroplating, physical and chemical vapordeposition. Coating materials available for thermal spraying can includemetals, alloys, ceramics, plastics and composites. They can be fed inpowder or wire form, heated to a molten or semimolten state, andaccelerated towards substrates in the form of micrometer-size particles.Combustion or electrical arc discharge can be used as the source ofenergy for thermal spraying. The spray 908 of particles can be directedtowards a target by the nozzle 1001. Resulting coatings are made by theaccumulation of numerous sprayed particles. The surface, such as of thevalve body 102, may not heat up significantly, allowing the coating offlammable substances.

Coating quality can be assessed by measuring its porosity, oxidecontent, macro and micro-hardness, bond strength and surface roughness.Generally, the coating quality increases with increasing particlevelocities. Thermal spraying includes numerous variations, includingplasma spraying, detonation spraying, wire arc spraying, flame spraying,high velocity oxy-fuel coating spraying (HVOF), high velocity air fuel(HVAF), warm spraying, and cold spraying. Plasma spraying uses ahigh-temperature plasma jet generated by arc discharge with temperaturesthat can be above 15,000 K, making it possible to spray refractorymaterials such as oxides.

One should note that conditional language, such as, among others, “can,”“could,” “might,” or “may,” unless specifically stated otherwise, orotherwise understood within the context as used, is generally intendedto convey that certain embodiments include, while other embodiments donot include, certain features, elements and/or steps. Thus, suchconditional language is not generally intended to imply that features,elements and/or steps are in any way required for one or more particularembodiments or that one or more particular embodiments necessarilyinclude logic for deciding, with or without user input or prompting,whether these features, elements and/or steps are included or are to beperformed in any particular embodiment.

It should be emphasized that the above-described embodiments are merelypossible examples of implementations, merely set forth for a clearunderstanding of the principles of the present disclosure. Any processdescriptions or blocks in flow diagrams should be understood asrepresenting modules, segments, or portions of code which include one ormore executable instructions for implementing specific logical functionsor steps in the process, and alternate implementations are included inwhich functions may not be included or executed at all, may be executedout of order from that shown or discussed, including substantiallyconcurrently or in reverse order, depending on the functionalityinvolved, as would be understood by those reasonably skilled in the artof the present disclosure. Many variations and modifications may be madeto the above-described embodiment(s) without departing substantiallyfrom the spirit and principles of the present disclosure. Further, thescope of the present disclosure is intended to cover any and allcombinations and sub-combinations of all elements, features, and aspectsdiscussed above. All such modifications and variations are intended tobe included herein within the scope of the present disclosure, and allpossible claims to individual aspects or combinations of elements orsteps are intended to be supported by the present disclosure.

1. A valve comprising: a valve body defining a body bore having a boreaxis, the valve body further defining a channel coannular with the bodybore and a valve opening wall, the channel comprising a channel surface,an inner edge, and an outer edge defining a seat retention groove, theouter edge meeting the valve opening wall, the seat retention groovecomprising a metal barrier, the metal barrier defining a first edge anda second edge, the first edge oriented at the valve opening wall and thesecond edge oriented at the channel surface; an annular valve seatpositioned in the channel, the annular valve seat comprising a radiallyinner surface; and a valve element positioned in the body bore andcoupled to the valve body, the valve element comprising a rotatable discconfigured to rotate about and between a closed position, in which therotatable disc is configured to prevent fluid from flowing through thevalve, and an open position, in which the rotatable disc is configuredto allow maximum fluid flow through the valve, the radially innersurface of the annular valve seat configured to seal against therotatable disc in the closed position.
 2. The valve of claim 1, furthercomprising a seating mechanism, wherein the seating mechanism comprisesa segment adjacent to an outer surface of the annular valve seat, thesegment configured to hold the annular valve seat in the channel andengage the seat retention groove.
 3. The valve of claim 2, wherein theseating mechanism further comprises a bolt, wherein the bolt comprises ahead that is received by the seat retention groove, the seat retentiongroove configured to prevent the bolt from rotating about a bolt axis.4. The valve of claim 3, wherein the bolt comprises a threaded tail thatis received by a hole in an outer side of the segment.
 5. The valve ofclaim 4, further comprising a nut disposed on the bolt, wherein rotatingthe nut in a first direction tightens the segment against the annularvalve seat.
 6. The valve of claim 1, wherein the valve body comprises acorrodible metal.
 7. The valve of claim 6, wherein the valve bodycomprises cast iron.
 8. The valve of claim 6, wherein the metal barrieris a corrosion-resistant metal barrier.
 9. The valve of claim 8, whereinthe corrosion-resistant metal barrier is stainless steel.
 10. The valveof claim 9, wherein the stainless steel is deposited by plasma spraying.11. The valve of claim 5, wherein the barrier is deposited by thermalspraying.
 12. A valve comprising: a valve body defining a body borehaving a bore axis, the valve body further defining a channel coannularwith the body bore, the channel comprising an outer edge defining anannular seat retention groove, wherein the annular seat retention grooveis coannular with the body bore of the valve body; a corrosion-resistantmetal barrier over the annular seat retention groove, thecorrosion-resistant metal barrier defining a first edge and a secondedge, each of the first edge and second edge coannular with the bodybore; and an epoxy coating over the first and the second edges.
 13. Thevalve of claim 12, further comprising: a compressible valve seat in thechannel, the compressible valve seat comprising an outer surface; asegment adjacent to the outer surface of the compressible valve seat,the segment comprising an outer side, the outer side defining a hole;and a bolt comprising a bolt head and defining a bolt axis, the bolthead disposed in the annular seat retention groove, the annular seatretention groove preventing the bolt from rotating about the bolt axis.14. A method of manufacturing a valve with a corrosion-resistantbarrier, the method comprising: obtaining a valve body defining a bodybore having a bore axis, the valve body further defining a channelcoannular with the body bore, the channel comprising an outer edgedefining a seat retention groove; and thermal spraying acorrosion-resistant barrier over the seat retention groove, wherein thecorrosion-resistant barrier is metal, wherein thermal spraying comprisesheating a material forming the corrosion-resistant barrier, and sprayinga plurality of particles resulting from heating the material; andapplying epoxy to the valve body after thermal spraying thecorrosion-resistant barrier.
 15. The method of claim 14, wherein theseat retention groove is configured to receive a head of a bolt and toprevent the bolt from rotating about a bolt axis.
 16. The method ofclaim 15, wherein the seat retention groove defines an inner wall, aradially inner wall, and a radially outer wall.
 17. The method of claim16, further comprising: inserting a compressible valve seat in thechannel, the compressible valve seat comprising an outer surface;placing a segment at the outer surface of the compressible valve seat,the segment comprising an outer side, the outer side defining a hole;placing a nut on the bolt; placing a tail of the bolt in the hole of thesegment; and placing the head of the bolt in the seat retention groove.18. The method of claim 14, wherein thermal spraying thecorrosion-resistant barrier comprises plasma spraying a stainless steelbarrier.
 19. The method of claim 18, obtaining the valve body comprisescasting the valve body from cast iron.
 20. (canceled)